I was curious about how many tags people put on their photos in
Flickr and whether more tags help you get into
interestingness.
So
using their fabulous
api I wrote a quick program to count the number of tags for photos
in
interestingness and compare them to photos in the huge
FlickrCentral
group. Numbers are averages and standard deviations for both the
author's own tags and for tags volunteered by others.

What's it all mean? Not much. The average FlickrCentral photo has 7.5
tags and the average Interesting photo has 8.0 tags. Well within the
standard deviations, not a good predictor. Photos in Interestingness do
have measurably more viewer contributed tags but that's not a
surprise; photos in Interestingness have more viewers.

So not an interesting result, but I love how easy it is to do this
kind of data mining with Flickr.

(For the record, I compared the top 100 interesting photos for each
day so far in July, 1900 photos, with the 500 most recent photos in FlickrCentral).